Question about 2001 Pontiac Grand Am SE

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Can a dirty injector cause a cold engine to be a hard starter ?

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Yes it can, i had a corvette with the # 6 fuel injector that was bad, it would start up, and run a few seconds , then die, wait a few minutes, crank it again, then sometimes , it wouldn't start, then i would wait a while and try it again, and it would fire up, and run a small amout of time , and then die, i checked the fuel injectors to see which one was not working, and found out that it was the # 6 injector.

Posted on Mar 22, 2011

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Hard to start fuel pump has been checked

Need much more information about the car, age, care it has had. Only 4 things cause hard start. Lack of Air coming into the intake, Lack of Fuel, Lack of spark, Lack of torque from the starter. Assuming the starter is good & battery, and fuel is there, i would check the spark plugs, and spark output. If it has a lot of miles check the Air Filter. The injectors could also be clogged. I always dump 2 bottles of injector cleaner in the tank every 2 months. If you have never done this i would go for 3 bottles. Again the spark cannot be weak, fuel pressure cannot be low, or have restrictions like dirty a fuel filter, or dirty fuel injectors or even bad Gas. And last a computer problem providing incorrect timing to the Injectors or Spark Plugs.

Apr 23, 2016 | Nissan Pathfinder Cars & Trucks

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My van is hard to start first thing in morning and has a new fuel pump

The fuel pump is just one of many components that could cause poor starting if not at peak efficiency. You don't say whether the engine is petrol or diesel powered but in both cases a good cranking speed is essential to cold starting and again in both cases sufficient fuel must be delivered into the combustion chambers in the right form; bad spray patterns due to worn or dirty injectors can cause bad starting, though most commonly in the case of petrol engines it is a poor spark or worn spark plugs and in the case of diesel engines tired or defective heater plugs that cause poor starting.

There is quite a bit to think about and quite a bit to check...

Feb 24, 2015 | 2001 Chrysler Town & Country

1 Answer

Code po 172

PO172 is system too rich. This code is probably coming in because you are stepping on the throttle to get it started. This really dumps alot of fuel into the engine. I would suspect that you have a fuel pump (or dirty fuel filter) that is getting weak. A weak fuel pump or dirty fuel filter, will not only cause the car to be hard starting, but will cause the fuel to "drip" from the injector and not be "sprayed". The fuel then "flows" into the combustion chamber and burns poorly. You need good fuel pressure for fuel injectors to function properly. Have the fuel pressure checked. See that the fuel pressure is within specification for that vehicle. If not, fuel filter, or fuel pump need replaced

Mar 01, 2014 | 2010 Chevrolet Chevrolet Malibu LTZ

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It is very likely the fuel pump pressure check valve is defective, this allows the fuel pressure to bleed off, and this causes hard starting. The pump is fairly expensive top replace so I suggest to confirm my guys have a local shop run a fuel pressure leak down test on the car. Other causes are a defective Engine coolant temperature sensor or dirty clogged fuel injectors, which is rare.

Sep 04, 2012 | Cars & Trucks

1 Answer

Dosen't start right poor gas mileage

If you do not have a "check engine" light on, then one of the many unmonitored components may be bad.

To start, the engine has a "cold" start routine. This system uses a temperature sensor to activate a step-up in RPM and enrichens fuel mix. There may be 2 on your model. You want to look at the one that does not work the dash gauge.

Skipping can be a misfire. A misfire wastes fuel and gives poor power.
A dirty fuel injector can flood the engine causing hard starts. Dirty sparkplugs can cause similar problems.

On cold starts, sticking valve lifters can also make an engine miss and then clear up as the oil flows when heated.

Sep 02, 2012 | 2006 Pontiac G6

1 Answer

Service light comes on 270 000 km car dies while driving put new plugs, lot of the time ahave to turn key 20 times then she starts


The problem with car starting is not only related with the plug, it also have to do with the battery sometimes, when the battery does not hold a charge, then the car will take long to start. While trying over time the battery is trying to pick a little charge to be able to come on.

If your engine has a carburetor, the hard starting problem is most likely choke related. If the engine cranks normally and the spark plugs are not worn or dirty, the choke probably needs to be repaired or adjusted.
The choke may be set too rich or too lean. Either way can cause hard starting. Inside the choke housing is a bimetal spring that regulates the tension on the choke according to temperature. If this spring is broken, the choke will not operate. If the choke linkage is rusty or jammed with varnish deposits or dirt, it may stick or not operate smoothly. Cleaning with carburetor spray or solvent may help alleviate a sticking problem.
On older fuel injected engines, a separate "cold start" injector is used to spray additional fuel into the intake manifold when a cold engine is first started. If this injector is not working, the engine can be hard to start. The injector is controlled by a timer and relay, so if either of these components is defective it can prevent the cold start injector from doing its job, too.
If your engine cranks slowly, your cold starting problem is not fuel related, but may be due to a weak battery, loose or corroded battery cables, or a weak starter.
Check for obvious problems first. Remove, clean and inspect the battery cables (both ends). Then check battery charge and condition. (More information on the condition of your battery and battery recharging is available.) If the battery charge is low, recharging the battery may temporarily solve your problem. But there's a reason why your battery is low. You probably have a charging system problem that requires further diagnosis. (More information on alternator is also available.) If your battery is more than four or five years old, it is probably near the end of its service life and needs to be replaced. A "load test" will tell you if it still has sufficient cranking capacity to provide reliable cold starting.
Slow cranking during cold weather (below freezing) can also be caused by oil that is too thick. A high viscosity oil such as straight 30 or 40 weight oil in the crankcase can make an engine very difficult to crank when the temperature drops. Switching to a lighter multiviscosity oil such as 10W-30 or 10W-40 should solve this problem.

Take care and good luck

Nov 06, 2010 | 1988 Oldsmobile Delta 88

1 Answer

I have a 99 olds alero. I can drive awhile park the car try to start it and it won't crank. Newer battery and alternator. Mechanic is thinking manifold sensor. plz help


Sep 26, 2010 | 1999 Oldsmobile Alero

3 Answers

97 Saturn sl2. Won't start after it gets warm. If you drive it for 15-20 minutes and try to restart it will not engage the starter. Wait a couple hours and it will start fine

It is your engine coolant temp sensor (ECTS). 99.9%. the saturn made them with a plastic tip, so they crack over time. A replacement should be about 15 bucks and not too hard to replace. You'll notice your engine temp gauge not working (always cold).

I don't know much about cars, but here's what happens. When your car is cold, the fuel runs rich. Your broken sensor is always reading that the engine is cold, but when it is warm, it runs too rich and floods your engine, not allowing it to start. When your engine is actually cold, everything is fine.

Mar 31, 2010 | 1997 Saturn SL

1 Answer


Get a tune up and especially have your injectors cleaned. Most FI vehicles have a cold start injector which if they are dirty could cause poor starting conditions when the vehicle is still cold

Aug 03, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

Car starts but won't restart when turned off

dirty or build up keep injectors from closing.they still be leaking fuel while engine off causing clean injectors.fill gas tank put a bottle injector cleaner in tank or have them professionally cleaned at garage.

Jun 01, 2009 | 1995 Honda Accord

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